1. Choquequirao is an ancient Incan site located in Cusco, Peru. It is often referred to as the \"sister city\" of Machu Picchu due to its similarities in architecture and significance as a religious and administrative center for the Incan Empire. Choquequirao translates to \"cradle of gold\" in Quechua, the language of the Incas. The site has been partially restored and visitors can hike to explore its terraces, plazas, and ceremonial buildings. However, Choquequirao sees far fewer tourists than Machu Picchu, and many consider it to be a hidden gem.

2. The site is open year-round from 6 am to 5 pm. There is no phone available for the site as it is quite remote. Visitors are recommended to book a tour or arrange transportation in advance.

3. Tickets for Choquequirao can be purchased on-site and cost around 60 soles (approximately $16 USD) per person. However, visitors are required to hire a guide and it is recommended to do so in advance. The hike to Choquequirao takes approximately two days and visitors can arrange transportation and guides through tour companies in Cusco. The hike is challenging but rewarding, with gorgeous views of the Andes and a chance to experience an important piece of Incan history.